Mindy McCready: Under Police Scrutiny at Time of Suicide?

When Mindy McCready talked to police in recent weeks, her account of how her boyfriend came to be found with a fatal gunshot wound to the head concerned police, a law enforcement source tells PEOPLE.

"At first, she said she hadn't heard the gunshot because the TV was too loud. Then she said she had heard the gunshot," the source says. "So obviously there were a lot of questions, and the Sheriff was asking for clarification."

McCready's death was blamed on what "appears to be a single self-inflicted gunshot wound," the Cleburne County Sheriff's Office said in a statement.

This differed from how the sheriff characterized Wilson's case. His cause and manner of death still have not been established by the coroner. It was McCready's publicist, and not a law enforcement official, who announced that Wilson had died of a self-inflicted gunshot wound.

After Wilson's death, McCready, 37, spoke to investigators three times, but they didn't feel as if they were through with her.

"At no point did [police] tell her she was a suspect, and she wasn't officially one," says the source. "But she knew that some of her answers didn't stand up to questioning. She was very cooperative, but she just wasn't making a lot of sense."